Antiinduction device



Nov. o. 1925 1,56o,773

F. M.,GOD DARD ANTIINDUCTION DEVICE Filed Sert. 22 921 Patented Nov. 10,1925.

UNITED STATES PATENT OFFICE,

FBEDERICK M. GODDARD, OF BROOKLYN, NEW YORK, ASSIGNOR TO WESTERN ELEG-TRIC COMPANY, INGOR-PORATED, OF NEV YORK, N. Y., A COBPORATON OF NEW'YORK.

ANTIINDU CTION DEVICE.

Application filed September 2 2, 1921. Serial No. 502,&27.

To a?! whom 'it may co cer:

Be it known that I, Flinin-:liron M. Gon- DARD, a citizen of the UnitedStates, residing at Brooklyn in the county of Kings State ot' 'ew York`have invented certain new and useful Improvenents in AntiinductionDevices ot which the *following is a tulhclear, concise, and exactdescription.

This invention relates to anti-induction devices its object being` toprovide a compact and convenient arranement ot' means .tor preventinginagnecic disturbances in adjacently placed electro-nagnetic devices,which means is readily removable to allow tor easy access, inspection,adjustment and repair ot' such apparatus.

hen two pieces ot apparatus, such as relays, are placed near oneanother, the magnetisn of the one affects the other. If the magnetismot' the one is changing a current is induced in the other and acondition exists which is termed cross-talk. It the magnetism ot the oneis not changing but remains stationary, the characteristics of the otherare atiected so that it may be energized by a smaller number of ampereturns or it may require a larger number of ampere turns, or itsreleasing conditions may be changed so that it may not operate in thenanner tor which it designed and adjusted in which case, a conditionexists which is termed cross-fire. Through extensive experiments, ithas` been discovered that shells ot conducti material placed aboutrelays will prevent cross-talk, but will not prevent cross-fire unlesssuch shells are also made of nagnetic material. hen rows of relays whichare not in talking circuits are placed adjacent one another an(cross-talk is not objectionable, it has been itoui'id that a simplesheet of ina-gnetic inaterial ilaced between the rows is an effectiveshield against cross-fire. Hence, an apparatus rack comprising means forremovably mounting the shields between rows of apparatus has beendevised as a convenient and eii'ective means ter inonnting great numbersof relays and other electronagnetie devices and overconing theditiieulties contingent on such close association which have heretoforebeen encountered.

In the drawings, Fig, l is a side sectional view, Fig. 2 is a-'rontview, and Fig. 3 is a top view showing the organization of standardsapparatus nonnting plates, shield holders and shields. Fig. 4 is asectional perspective view showing the method of se curing the shieldholders when the apparatus niounting plates are secured to the back ofthe standards; and Fig. 5 is a sectional perspective View showing` themethod of se-- cnring the shield holders whenthe apparatus niountingplates are Secured to the frontoT the standards.

The standards l may be in the form ot I beams as shown in the drawings,or any other convenient .term ot structural steel. Secured to the Ibeams are apparatus mounting plates 2 on which are mounted rows ofrelays 3 and l. The fiat type relay such as 3 may be secured to themounting plates by screws and the round type relay such as %t may bebolted to the mounting plates. Channel bars 5 bent in the form ot' an Lare riveted to securing plates 6, which are secured to the mountingplates by the same screws that attach the mounting plates to the Ibeams. These channel bars may be Secured either to the back ot' thenounting plates as shown in Fig. et, or to the front of the mountingplates as shown in Fig. 5, so that they will protrude between the rowsof relays in the same direction the axes ot the relays and form aconvenient means for holding the magnetic shields. These shields 7comprise a plate of nag netic material long' enough to fit in therecesses ot the channel bars Secured to the back and front edges ot thisshield 7 are woodcn or fiber strips 8 which may be used as desig nationstrips and on which characters representing the position of a relay inits circuit may be printed. In order to hold the plate 7 securely inplace springs 9 are riveted near the ends of the plote and serve to holdthe shield tirn'ily within. the recesses of the Channels, Extensions 10of the securing plate G are provided to prevent the shield 7 from beingpushed too 'tar backward. hen the channel bars 5 are Secured to thefront ot' the nonnting plates 2, as shown in Fig. 5, the extensions lOalso serve to space adjacent nonnting plates so that the designationstrip 8 may pass between thena This organization, as described, providesfor the ready removal of the shield 7 for inspeetion, adjustment andrepair of the relays.

WVhat is claimed s:

l. An apparans raek comp'sng standards, apparatue mountng plates Securedto said standards, rows of apparatns mounted on said plates, ehannelsmeunted on said Standards between said plates, and shelds z'ranged toslide in said Channels se as to be nte'posed between adjacent rows ofsaid apparatus.

2. An apparatus-'ack comprsng shane-- ards, apparatus mountng platesSecured to sa'd standards, rows of appa'atns on said planes Channelsmonntec 011 said standards between said plavtes, and shelds of magneticmaterial arranged to slide in said Channels so as to be nte'posedbetween adjacent rows of said appa'atus 3. An apparatus raek comprsngstandards, apparatus mountng plates Secured to said standards, rows ofappafatus mounted on said plates; removably nounted shields between saidrows, and'desgnaton strips attached to 'said shelds.

4:. An apparatus rack comprsng standards, appa''atus nountng platesSecured to said standards, rows of app-aratus mounted on said plat es,Channels mouted on said standards between said; plafces, sh lds arangedto slide in said channel so as to be nte'posed between adjacen rows ofsaid apparatus, and desgnaton strip-s attached to the edges ef saidshelds.

5. An apparatusraek comprsng standards, apparatus mountng plates Securedto said standards, rows of appara'tus mounted on said plates, Channelsmounted on said standards between said plates, shelds ar- 'anged toslide in said ehames so as to be nterposed between a-djacent rows OI"said apparatus, and sp'ngs fer retanng said shelds in said Channels Inwtness whereof, I hereun 'so subscribe my name this th daV of SeptemberA. D.,

FREDERCK M. GODDARD.

